Precor M9.55 User Manual
Low Impact Treadmill
Owner’s Manual
page 1
IMPORTANT SAFETY INSTRUCTIONS
When using an electrical appliance, basic precautions should always be taken,
including the following:
• Read all instructions before using the M9.55 treadmill. These instructions
are written to ensure your safety and to protect the unit.
Before beginning any fitness program, you should obtain a complete physical
examination by your physician.
Il est conseillé de subir un examen médical complet avant d’entreprendre tout
programme d’exercise. Si vous avez des étourdissements ou des faiblesses,
arrêtez les exercices immédiatement.
DANGER
To reduce the risk of electrical shock always unplug the treadmill from the
electrical outlet immediately after using and before cleaning.
WARNING
To reduce the risk of burns, fire, electric shock, or injury to persons, take the
following precautions:
• When it is plugged in, do not leave the M9.55 unattended. Unplug the
treadmill from the power source when it is not in use, and before putting on
or taking off parts.
• Do not allow children on or near the M9.55 treadmill.
• Use the M9.55 only for its intended purpose as described in this manual. Do
not use accessory attachments that are not recommended by the manufacturer—such attachments might cause injuries.
• Never operate the unit if it has a damaged cord or plug, if it is not working
properly, if it has been dropped or damaged, or dropped in water. Return
the M9.55 to a service center for examination and repair.
• Keep the power cord and plug away from heated surfaces.
• Never block the air vents while operating the treadmill. Keep the air vents
clean and free of lint, hair, or anything that might impede the free flow of air.
• Never drop or insert objects into any opening. Keep hands a way fr om mo ving
parts.
• Do not use outdoors.
• Do not operate where aerosol (spray) products are being used or where
oxygen is being administered.
• When the treadmill is not in use, disconnect the unit by turning the power
switch to the OFF (O) position, then remove the power plug from the wall
outlet.
IMPORTANT SAFETY INSTRUCTIONS
WARNING
page 2
Connect the M9.55 to a properly grounded outlet only. The M9.55 treadmill must
be connected to a 20 amp dedicated circuit. See
5.
Grounding Instructions
on page
Personal Safety
When using the treadmill, take the following precautions:
• Do not allow children on or near the treadmill. Do not leave children unsupervised around the treadmill.
• Assemble and operate the treadmill on a solid, level surface. Locate the treadmill a
few feet from walls or furniture. Keep the area behind the treadmill clear.
• Maintain the treadmill in good working condition. (Refer to the Maintenance
section.) Run through a check list prior to each use. Make sure that all fasteners
are secure and the belt is clean and running smoothly.
• Turn OFF (O) and unplug the treadmill when adjusting or working near the rear roller.
Do not adjust the running belt when someone is standing on the unit.
• Keep all electrical components, such as the motor, power cord, and I/O switch, a way
from liquids to prevent shock. Do not set anything on the handrail, display console, or
hood. Place liquids in the appropriate receptacles.
• The security clip should be attached at waist level prior to beginning a workout. A
cord connects the security clip to the red STOP button on the console. If you
encounter difficulties, the running belt can be stopped by pulling on the cord.
• To help prevent unauthorized use, the M9.55 is equipped with password protection. The password involves entering three keys in sequence. Refer to Entering a
Password on page 19.
• Wear proper exercise clothing and shoes for your workout—no loose clothing.
Do not wear shoes with heels or leather soles. Check the soles of your shoes
and remove any dirt and embedded stones. Tie long hair back.
• Keep all loose clothing and towels away from the running surface. Tie long hair
back. The running belt will not stop immediately if an object becomes caught in
the belt or rollers.
• Use care when getting on or off the treadmill. Use the handrail(s) whenever
possible. Step onto the running belt when the speed is at 1 mph (1.5 kph). Never
step off the treadmill while the running belt is moving.
• Before the running belt begins moving (prior to your workout), and after it stops (at
the end of your workout), straddle the belt by placing your feet firmly on the right
and left side platforms.
• Never turn ON the treadmill when someone is standing on the machine.
• Keep your body and head facing forward. Never attempt to turn around on the
treadmill when the running belt is moving.
• Do not rock the unit. Do not stand on the handrails, display console, or hood.
• Do not attempt to service the treadmill yourself other than the assembly and
maintenance instructions found in this manual.
• Do not overexert yourself or work to exhaustion. If you feel any pain or abnormal
symptoms, stop your workout immediately and consult your physician.
Precor treadmills are designed for the enjoyment of the serious runner as well as
the dedicated walker. By following the above precautions and using good common
sense, you will have many safe and pleasurable hours of healthful exercise with
your Precor treadmill.
Precor Heart Rate Option—Safety Guidelines
The Precor Heart Rate Option was created and designed exclusively for Precor
products. The equipment is extremely sensitive—you should use the heart rate option
page 3
with this in mind and take time to read the guidelines found on page 39.
RFI — Radio Frequency Interference
Federal Communications Commission, Part 15
The M9.55 treadmill has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation. The M9.55 treadmill generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the owner’s manual instructions,
may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If the M9.55 treadmill does cause harmful interference to radio or television reception, which can be determined by turning the M9.55 treadmill OFF and ON, you are
encouraged to try to correct the interference using one or more of the following
measures:
• Reorient or relocate the receiving antenna for your TV, radio, VCR, etc.
• Increase separation between the treadmill and the receiver (TV, radio, etc.).
• Connect the treadmill into a different power outlet—on a dedicated circuit
different from the one used by the receiver (TV, radio, etc.). No other appliance
should be plugged into the same power outlet that the treadmill is connected to.
• Consult an experienced radio/TV technician for help.
CAUTION
Per FCC rules, changes or modifications to the
treadmill not expressly approved by Precor, could
void the user’s authority to operate the equipment.
page 4
Canadian Department of Communications
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioéélectriques dépassant les
limites applicables aux appareils numériques de la class B prescrites dans le
Règlement sur le brouillage radioélectrique édicté par le ministére des Communications du Canada.
European Applications
This product conforms to the requirements of the European Council Directive 89/336/
EEC, Electromagnetic Compatibility and has been tested to the following standards:
EN55022, Limits & Methods of Measurement of Radio Interference, Information
Technology Equipment (Class A).
EN50082-1, Generic Immunity Standard for Residential, Commercial and Light
Industrial Products (Class A).
This product additionally conforms to the requirements of the European Council
Directive 73/23/EEC, Low Voltage Directive and has been tested to the following
standard:
IEC 335-1, Safety of Household and similar Electrical Appliances.
European Applications - 240 Volt Units Only
This product has been tested to the requirements of EN55022, “Limits & Methods of
Measurement of Radio Interference, Information Technology Equipment.” Per that
standard, the M9.55 treadmill is a Class B product. In a domestic environment, these
products may cause radio interference, in which case the user is responsible to take
adequate measures to alleviate the interference.
Safety Approval
When identified with the ETL-c logo, the treadmill has been tested and conforms to
the requirements of CAN/CSA-E-335-1/2-94, Safety of Household and Similar
Electrical Appliances.
Grounding Instructions
The M9.55 Low Impact Treadmill must be grounded. If it should malfunction or break
down, grounding provides a path of least resistance for electric current which
reduces the risk of electrical shock. The treadmill is equipped with a power cord
having an equipment-grounding conductor and a grounding plug. The plug must be
inserted into an appropriate outlet that is proper ly installed and grounded in accordance with all local codes and ordinances. If you do not follow these
Instructions
Diagram 1
Correct power outlet for
U.S. Markets: 15 amp
120-volt and 240-volt plugs.
Grounding
, you could void the Precor limited warranty.
120-volt grounding plug 240-volt grounding plug
DANGER
Improper connection of the equipment-grounding conductor can result in a risk of
electric shock. Check with a qualified electrician or service person if you are in doubt as
to whether the treadmill is properly grounded. Do not modify the plug provided with the
treadmill—if it doesn’t fit the outlet, get a proper outlet installed by a qualified technician.
120V Units Designated for U.S. Markets
The M9.55 treadmill must be connected to a 20 amp
nominal rating of 120-volts. The treadmill’s grounding plug looks like the plug illustrated in Diagram 1. The power outlet must have the same configuration as the plug.
No adapter should be used with this product.
240V Units Designated for U.S. Markets
The M9.55 treadmill must be connected to a 20 amp dedicated circuit having a
nominal rating of 240-volts. The treadmill is factory-equipped with a specific power
supply cord to permit connection to a proper electric circuit. Make sure that the
treadmill is connected to an outlet having the same configurations as the plug. See
Diagram 1. No adapter should be used with this product. If the treadmill must be
reconnected for use on a different type of electrical circuit, the reconnection must be
made by qualified service personnel.
dedicated
circuit having a
ATTENTION: Haute Tension
Débranchez avant de réparer
page 5
Table of Contents
Important Safety Instructions............................................................. 2
Personal Safety ................................................................................. 3
Precor Heart Rate Option - Safety Guidelines .................................. 3
RFI — Radio Frequency Interference ................................................ 4
European Applications ...................................................................... 4
Safety Approval ................................................................................. 5
Grounding Instructions ...................................................................... 5
Before Y ou Begin ..............................................................9
1
Obtaining Service .............................................................................. 9
Unpacking the M9.55 Low Impact Treadmill ...................................... 9
Optional Equipment ........................................................................... 9
Hardware Kit......................................................................................10
Acquiring the Appropriate Tools ........................................................10
Setting Up the Treadmill.................................................11
2
Installation Requirements.................................................................. 11
Assembly Instructions ....................................................................... 11
Turning the Unit ON and OFF ............................................................17
Checking the Alignment of the Running Belt.....................................18
Using the M9.55 Treadmill..............................................19
3
Safety Features .................................................................................19
Using the Security Clip ......................................................................19
Entering a Password .........................................................................19
Workout Tips......................................................................................20
Quick Steps to Working Out ..............................................................21
Cooling Down After Your Workout......................................................22
Pause, Cool Down, Workout Summary, and Exit Features ...............23
The M9.55 Display ..........................................................25
4
Features on the Display Console ......................................................25
Changing User Display Fields ...........................................................26
Deleting Workout Statistics................................................................27
Smart Rate
Heart Rate Display ............................................................................28
Upper Display ....................................................................................28
Lower Display ....................................................................................28
Keys on the Display Console.............................................................29
Keypad Tips.......................................................................................30
®
.......................................................................................28
Programming the M9.55 Treadmill ................................32
5
Selecting a U.S. Standard or Metric Display......................................32
Securing the Treadmill with a Password............................................ 3 3
Creating a User Name.......................................................................33
Viewing the Odometer, Hours of Use,
Software Version, and Error Log........................................................34
page 6
The M9.55 Courses.........................................................35
6
Using the POLAR® Equipment ......................................41
7
Maintenance....................................................................42
8
Course Features and Course Descriptions .......................................35
Utilizing the Smart Rate
Utilizing Heart Rate Interactive Capabilities ......................................39
Heart Rate Course ............................................................................40
Wearing the POLAR® Chest Strap ....................................................41
Storing the POLAR
Cleaning the Equipment ....................................................................42
Aligning the Running Belt ..................................................................43
Servicing the Treadmill ......................................................................43
Long Term Storage ............................................................................43
Exploded Views .................................................................................44
Warranty Card ...................................................................................51
Specifications ..................................................................... back cover
®
Feature......................................................39
®
Chest Strap.......................................................41
page 7
Notes:
:
page 8
Before You Begin
1
This manual explains how to assemble, use,
and maintain the M9.55 Low Impact Treadmill. The following conventions are used in
this manual.
“Note:” Contains additional information that
applies to the preceding text.
“Important:” Indicates information to which
you should pay special attention.
“CAUTION:” Indicates steps or information
necessary to prevent harm to yourself or
damage to the equipment.
“WARNING:” Provides instructions to
prevent electrical damage to the equipment
and prevent injuries to yourself or others.
“DANGER:” Indicates steps you must
take to prevent electrical shock.
Thank you for purchasing the Precor M9.55 Low Impact Treadmill. Precor has incorporated
an innovative design and some of the most popular features in the health and fitness
industry into the M9.55.
Ground Effects allows the treadmill’s running bed to absorb and cushion the shock of
walking or running by utilizing specially formulated elastomeric springs. Integrated
Footplant Technology (IFT) replicates the natural walking and running motion of your
feet which helps reduce shock and pounding to your body.
The M9.55 offers an easy-to-understand display console that provides motivating
feedback about your workout. The ultra-sensitive keypad lets you select data and
control your workout session. Precor Smart Rate® — a visual aid that lets you, the user,
see your heart rate with a glance, provides the latest in cardiac monitoring. Note that for
the heart rate features to appear, a POLAR® chest strap must be worn.
The M9.55 Low Impact Treadmill is for household use only. It has many unique features
which set it apart from conventional treadmills. To maximize your use of the treadmill,
please study this guide thoroughly.
Obtaining Service
Do not attempt to service the M9.55 Low Impact Treadmill yourself except for minor
belt adjustments and maintenance as described in this manual. The M9.55 treadmill
does not contain any user-serviceable parts.
For information about product operation or service, check out the Precor Web Site at
www.precor .com or call Precor Customer Support at 1-800-347-4404.
CAUTION: This unit weighs over 350
pounds (157 kilograms). To avoid injury
and to ensure the safety of the unit and
yourself, g et adequate assistance before
unpacking your treadmill. Break down the
container’s side walls before removing
anything from the box.
If you call or e-mail Precor Customer Support, have your model and serial number
available.
The serial number on the treadmill is printed on a label located on the base frame. To
locate the serial number, verify that the treadmill is turned OFF. Then, stand at the
rear of the unit and face the display console. Kneel down and look under the running
bed at the left, inboard-side of the base rail. For future reference, write the serial and
model number and date of purchase in the space provided below.
Model #: ________ Serial #: _________________________ Date purchased: ____
If you have any questions regarding the treadmill, use the model and serial numbers
whenever you contact Precor Customer Support.
Unpacking the M9.55 Low Impact Treadmill
The M9.55 treadmill is carefully tested and inspected before shipment. Precor ships
the unit in components, as listed below:
• running bed assembly
• hood
• front assembly (includes 2 upright supports and display console)
• owner’s manual and hardware kit
Optional Equipment
An additional POLAR® chest strap or the M9.55 Long Handrail Option can be
purchased by calling Retail Sales at 1-800-786-8404 or visiting the Precor web site
at www.precor.com.
page 9
Diagram 2
Hardware Kit.
A
C
E
F
B
D
Carefully unpack the pieces of the treadmill and lay them on the floor near the
location where you plan to use the treadmill.
G
Hardware Kit
After unpacking the treadmill, open the hardware kit (refer to Diagram 2) and make
sure that you have the following items:
(A) twenty — 1” long buttonhead screws
(B) fourteen — flat washers
(C) four — 3/4” long flat head screws
(D) four — flat washers
(E) 1/4” hex key — belt adjustment
(F) 3/16” hex key — mount uprights, display and handrails to base frame
(G) 5/32” hex key — install handrails to display and hood to base
If any items are missing, contact Customer Support at 1-800-347-4404.
Note: After assemb ling the treadmill, be sure to store the hex keys in a secure place. The
tools are used for specific maintenance procedures that are described in this manual.
Acquiring the Appropriate Tools
Obtain the following tools
Wire cutter
Bubble level
Medium weight string [about 1 foot (30 cm)]
Strong adhesive tape
SAE Standard socket set with a ratchet or 8” Crescent wrench
before
assembling the treadmill.
page 10
Setting Up the Treadmill
2
CAUTION: Do not remo ve or otherwise
bypass the 3-prong plug with an adapter or
extension cord in order to use a nongrounded outlet. Electrical damage can
occur if the treadmill is connected to an
improper power source.
You do not need any special knowledge or experience to set up the treadmill.
However, you will need assistance. Because of the size and weight of the treadmill, it
is recommended that at least three adult persons assemble it.
Installation Requirements
Follow these installation requirements when installing the treadmill.
treadmill according to the following guidelines, you could void the Precor limited warranty.
• Set up the treadmill on a solid, flat surface. Unpack and assemble the
treadmill close to where you plan to use it. Make sure that the flat surface under
the unit is smooth and level. A level unit is required for the user’s safety and
proper operation.
• Provide ample space around the unit. Open space around the unit makes for a
safer mount and dismount.
• Fill out and mail the limited warranty card. Be sure that the treadmill is turned
OFF. To locate the ser ial number, place yourself at the rear of the treadmill facing
the display console, kneel down and look under the treadmill on the inboard-side
of the running bed of the left, rear corner. Write the serial number onto the Precor
limited warranty card found on the back cover of this manual. Refer to
Service
• Use the appropriate voltage, dedicated circuit, and grounding as specified on
the treadmill. The treadmill is a vailable in both 120-volt and 240-volt models. Refer
to the treadmill’s identification label to determine the voltage that your treadmill
requires. Both the 120-volt and 240-volt models require a dedicated 20 amp circuit.
Assembly Instructions
Take the following steps to assemble the treadmill. We recommend
people help with assembling the unit.
on page 9 and write the number(s) there as well.
If you do not install the
Obtaining
at least
three
CAUTION: Before assembling (or
disassembling) the unit, turn OFF the
treadmill and unplug it’s power cable
from the power outlet. Do not assemble
(or disassemble) the treadmill if it is
plugged into a power source. To avoid
injury and ensure your safety, get assistance before lifting the treadmill off the
pallet and rolling it onto the floor. Do not
drop the unit.
Note: The M9.55 treadmill has the same assembly instructions. The differences
appear in the display console and course programs.
1. Obtain assistance. Ask for assistance to help assemble the treadmill. Have the
assistant(s) help place the shipping carton close to the location where you plan
to use the treadmill. Breakdown the side walls of the shipping carton so that they
lie flat. Remove the loose contents.
2. Remove the treadmill from its shipping pallet. Eight f asteners secure the treadmill
to its pallet. Use a socket and crescent wrench to loosen and remove the 4 lag bolts
that hold the treadmill to the pallet and the 4 screws (2 on each side) that thread
through the bracket and into the unit. Discard the fasteners. Once the fasteners have
been removed, obtain several assistants to lift the treadmill off the shipping pallet.
3. Make sure that the power is OFF. Check the ON/OFF power switch on the front
of the base assembly. Place the switch in the O (OFF) position. Make sure that
the treadmill is not plugged into a power source.
4. Loosen the screws that attach the hood to the base. With the supplied hex key,
loosen the 2 screws on the front panel and the 2 screws on the side (1 on each
side). To detach the hood from the base, stand at the side of the treadmill. Lift the
hood up slightly and slide it toward the rear of the unit. Refer to Diagram 11.
5. Remove 10 buttonhead screws (A) and washers (B) from the Hardware kit.
Place the washers on the screws and split the screws into two sets of 5. Put the
sets in easy reach of the column support mounts (5 screws per side).
page 11
Diagram 3
Attach the left upright
support to the base.
Upright support
(left side)
Column support
Base assembly
Diagram 4
6. Attach the
the
left
support into the base assembly and align all 5 mounting holes (3 on the side, 2
in the front). Insert 5 screws (A) and washers (B). Thread the screws into the
unit, but leave them loose for final adjustments. Do not securely tighten the
screws until after the display console and handrails have been installed.
Note: The left or r ight side of the treadmill can be deter mined when you stand
near the rear roller and face the motor.
left side
upright support. This is the one you want to install first. Place the upright
upright support to the base assembly. Diagram 3. Locate
Route the cable through the upright support.
1
2
Route the cable through the hole
and tape it to the side of the
upright support.
CAUTION: To avoid damage to the display
cable, read and follow these steps carefully. Damage to the cable due to improper
assembly is not covered by the Precor
limited warranty.
page 12
7. Route the display cable. Diagram 4. Have an assistant hold the other support
upright. See “Note:” below. Position the display console above the upright
support and route the cable through it. Pull the cable through the hole in the
upright support. Lay the display console and upright support on the floor.
Note: Tying one end of a string to the end of the cable and the other end to a
washer may help in routing the cable. You can drop the washer through the
upright support and pull the cable through. Refer to Diagram 4, #2.
8. Secure the display console to the upright support. Diagram 5. Attach the
console to the right side support before placing the assembly onto the treadmill.
To do this, take the following steps:
Diagram 5
Attach the display
console.
Upright support
Cable
Right side support
Display console
(bottom side)
a. Make sure that the cable is routed through the hole in the upright support.
b. Place a protective base (cardboard or plastic sheeting from the shipping
container) on the floor. Position the display console (display-side down) onto it.
c. Remove 2 screws (A) and washers (B) from the hardware kit.
d. Align the upright suppor t mounts with the display console’s. Insert 2 screws and
washers. Tighten the screws securely with the hex key provided.
9. Attach the display console assembly to the base. Diagram 6. Take the
following steps to install the display console assembly onto the treadmill.
a. Position the display console and right upright support over the column support
mount located on the base.
Diagram 6
CAUTION: Do not crimp or pinch the cable!
Crimped or pinched cables are not covered
by the Precor limited warranty.
Connect the cable
and attach the right
side support to the
base.
2
Route cable
through hole.
3
1
b. Carefully lower the upright support and align the mounting holes. See Diagram 6
#2. Check that the display console is seated proper ly on the left upright support.
Insert 5 screws (A) with washers (B). Thread the screws into the unit, but leave
them loose for final adjustments. Do not securely tighten the screws until after the
display console and handrails have been installed.
c. Plug the connector into its receptacle on the lower board. A definite “click” is
heard when the cable is properly attached. See Diagram 6 #3. If you do not hear
and feel the connector “snap” into place, reinsert it.
page 13
Diagram 7
Attach the
console to the left
upright support.
Buttonhead screws
10. Secure the display console to the left upright support. Diagram 7. Align the
mounting holes on the console to those on the left upright support. Insert 2
screws (A) and washers (B). Do not securely tighten the screws until after the
handrails have been attached.
Important: With the handrails attached, the width of the treadmill is 36.75”
(93 cm). It will not fit through a standard 36” doorway.
Diagram 8
Handrail alignment and installation.
1
2
Console
extension
3
11. Attach the handrails. Diagrams 8 and 9. For ease of assembly, place the side
rails or rear feet on blocks. Obtain assistance to lift the treadmill. Do not place
blocks beneath the running bed.
To attach the handrails, perform the following steps on
a. Alignment pins on the top of the handrails necessitate sliding the handrails into
the console assembly at an approximate 45o angle. Position the handrail as
shown in Diagram 8 and slide it onto the console extension. When the alignment
pins are fully engaged, carefully lower the handrail toward the base. Place as
washer (D) on each of 2 screws (C). Insert the screws and finger-tighten.
one side at a time
:
page 14
Diagram 9
Secure the handrail to the base.
Handrail bracket
b. Align the handrail bracket with the 3 base mounts and insert 3 screws (A) and
washers (B). See Diagram 9. Tighten the screws securely.
c. Retur n to the upper handrail screws and securely tighten each one.
d. Perform steps a. through c. on the opposite side.
e. Obtain assistance and remove the blocks from beneath the base.
Diagram 10
Tighten front plate
screws first. Then
securely tighten
all fasteners.
Tighten these
screws first on
both sides of the
front plate.
12. Tighten all mounting screws with the hex keys provided. Diagram 10. Star t at
the front of the treadmill with the 4 screws that attach the upright supports to the
front plate. Tightening these screws first helps pull the rest of the treadmill’s par ts
into alignment. Then, proceed with securely tightening the upright supports and
console assembly screws.
page 15
Diagram 11
Secure the
hood.
Slide the
hood under
the 2 screws
found on the
inboard side
of both
upright
supports.
1
3
CAUTION: Do not overtighten the screws
or you may inadvertently cause stress
cracks in the plastic hood.
Diagram 12
2
13. Attach the hood. Diagram 11. Place the hood over the motor and slide it
the upper 4 screws (see Diagram 11 #1) and
on each side) of both upright supports.
As you lower the hood, slide the hood under the washers and onto the screws (2 in
the front, 1 on either side of the treadmill). See Diagram 11, #2 and #3. Retighten the
screws that you loosened in step 4.
tween the base assembly and the washers. The washers must be on the
outside of the hood.
Level
the
unit.
Tighten the screws securely using the hex key provided.
4
over
the 2 lower screws (1 found
Be sure that the hood is sandwiched be-
under
21
page 16
14. The M9.55 has adjustable rear feet. Check to make sure that the running surface
is level (use a bubble level as shown in Diagram 12). If the treadmill is placed on
a slightly, uneven surface, adjusting the rear feet can help, but will not compensate for extremely uneven surfaces.
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